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OSXHIDQueue.java

/*
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 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package net.java.games.input;

import java.io.IOException;
import java.util.Map;
import java.util.HashMap;

/**
* @author elias
* @version 1.0
*/
00049 final class OSXHIDQueue {
      private final Map map = new HashMap();
      private final long queue_address;

      private boolean released;
      
      public OSXHIDQueue(long address, int queue_depth) throws IOException {
            this.queue_address = address;
            try {
                  createQueue(queue_depth);
            } catch (IOException e) {
                  release();
                  throw e;
            }
      }

      public final synchronized void setQueueDepth(int queue_depth) throws IOException {
            checkReleased();
            stop();
            close();
            createQueue(queue_depth);
      }
      
      private final void createQueue(int queue_depth) throws IOException {
            open(queue_depth);
            try {
                  start();
            } catch (IOException e) {
                  close();
                  throw e;
            }
      }

      public final OSXComponent mapEvent(OSXEvent event) {
            return (OSXComponent)map.get(new Long(event.getCookie()));
      }

      private final void open(int queue_depth) throws IOException {
            nOpen(queue_address, queue_depth);
      }
      private final static native void nOpen(long queue_address, int queue_depth) throws IOException;

      private final void close() throws IOException {
            nClose(queue_address);
      }
      private final static native void nClose(long queue_address) throws IOException;

      private final void start() throws IOException {
            nStart(queue_address);
      }
      private final static native void nStart(long queue_address) throws IOException;

      private final void stop() throws IOException {
            nStop(queue_address);
      }
      private final static native void nStop(long queue_address) throws IOException;
      
      public final synchronized void release() throws IOException {
            if (!released) {
                  released = true;
                  try {
                        stop();
                        close();
                  } finally {
                        nReleaseQueue(queue_address);
                  }
            }
      }
      private final static native void nReleaseQueue(long queue_address) throws IOException;

      public final void addElement(OSXHIDElement element, OSXComponent component) throws IOException {
            nAddElement(queue_address, element.getCookie());
            map.put(new Long(element.getCookie()), component);
      }
      private final static native void nAddElement(long queue_address, long cookie) throws IOException;

      public final void removeElement(OSXHIDElement element) throws IOException {
            nRemoveElement(queue_address, element.getCookie());
            map.remove(new Long(element.getCookie()));
      }
      private final static native void nRemoveElement(long queue_address, long cookie) throws IOException;

      public final synchronized boolean getNextEvent(OSXEvent event) throws IOException {
            checkReleased();
            return nGetNextEvent(queue_address, event);
      }
      private final static native boolean nGetNextEvent(long queue_address, OSXEvent event) throws IOException;

      private final void checkReleased() throws IOException {
            if (released)
                  throw new IOException("Queue is released");
      }
}

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